Piston oil shield



Filed Sept. 1928 TOR- ATTORNEY 420. I I. I

' provides shieldl for piston 2. Such's 'eldiL- Patented New. 5, i929 insane @FFEQE now he .a' masses, or sonnets, vnaernrn PISTON H4 SHIELD T hpplicationfiled scpte'mher 5, 192%. Serial No. 804,014.

This invention relates to gasoline engines.

piston shields for explosiveprinciple wherein a piston is used a to compress the mixture-of gasoline and air and thento receive the impulse of the exlosion the underside of the to of the piston ecomes quite hot. Oil is splas ed up against theheated underside of the piston top where wit carbonizes sometimes run an incandescent cake on the under surface of the piston head. This carbonization'increasesthe heat of the piston andfhreaks down the'oil so that. its lubricating powers as well as its coolingpowers are much reduced.

One of the objects of this invention is to, provide'means to prevent carhonization of the oil ontheunderleide of the piston head. Another object of the invention is'to provide as means for prolongthe useful properties of the lubricating o in'the motor.

vStill another objector the invention is to prolong the life of a gasoline-motor. 1

Referring to the drawing: v Figure 1 is a sectional view of a p ston having a shield theieinhodying the princi%es of my invention. o

igure 2 is' a cross sectional view along the line 2, 2,.oi Figure 1 of the-sh eld. dhlFigure 3 is ahottom plan view of the els i Figure i is a modified pl view showing a mdified form of shield in plan view prior 7 to being bent to fit the inside of the piston.

I 5 is a sectional View ofa piston wherein the'modiiied form of shield is shown and wherein the shield is supported by legs or'channels foedin the interior of the z -r out myinvention, 1 pro ose may be formed as shown in Figures 1 and of a single 'pieceof' metal having cutout porf tions 10 to accoodate'th'e'wrist pin bosses et .3. Shield '1 is sprung-into place-and lain contact with the inside walls of iston 2 only adjacent the mouth of the cup s aped shield 1, that is onlya. small-portion of the shield nor-the rim is in contact with the inside or by bolts 11, althoug In the usual engine operating under the "*eerior of said piston for a shield in said piston having out out of piston 2. Itrehearse shield can be secured to the skirt of iston 2 by welding such is not required since once the cup is snapped into place and the connecting rodpositioned it is impossible for the shield 1 to become dislocated. I "further propose to provide an asbestos gasket 5 between the shield 1 of the top of the piston 2 to prevent contact between the top of the shield 1 and the underside of the'piston head 2. Where a suficient air gap is possible; the heat insulating gasket 5 may be'dispensed with. in certain engines the cup form oi shield 1 is dificult to insert and the form. shown in Figure 4 or modification thereof must be used. In the modified form the shield I 1 is formed from a Maltese cross having two of the arms of the Maltese cross cut out to accommodate the wrist pin bosses 3. The arms of the Maltese cross are bent to conform to the inside of piston 2 and can be secured in place by welding or by bolts or by test, lugs or channels as shown in Fi e 5, reference numeral 6, 7. A gasket 5 of eat insulating material can also be used as shown in Figures e and 5.

lit will thus be seen that I have invented a piston shield of simple construction and of light weight'wherein carbonization upon the undersurface of the piston head is prevented and the temperature of the oil is not raised up to the carbonization point as the shield is only in contact with the lower portion of the .sirirtof thepiston. The skirt of the pieto n being relatively cool as compared to the piston face and hence transmits less heatto my invention will function more .eficiently. w

What ll claim is: v 1. line motor a piston hossesin thein the wrist pin hearportions for said bosses to extend through, the bottom edge of said shield only contacting with the interior of said piston at its lower portion and means for'sec vat the lowerportion/said shield within. sat piston.

2. In a motor a piston. hosses in the interior or said piston for the wrist pin hear ings, an oil shield in said piston having cut out portions for said bosses to extend through, said shield having a skirt extending below said bosses, means for securing said skirtto said piston and means for heat insulating the upper portion of said shield.

3. In a motor piston, a shield formed from sheet metal in'the shape of a Maltese cross having two of the arms of the cross with U-shaped cutout portions to fit over and around the bosses within the piston, said shield forming a cup shaped chamber within said piston when inserted, the bottom ed es contacting with the lower portion of the si es;

of said piston to prevent the passage of oil past the shield an means for insulating the top of said shield from the to of said piston.

HOWARD AV'ER FLAGGE. 

